Cellulose nanofibril (CNF) based aerogels prepared by a facile process and the investigation of thermal insulation performance

Jiang, Shuai; Zhang, Meiling; Li, Mengmeng; Liu, Liu; Liu, Lifang; Yu, Jianyong

doi:10.1007/s10570-020-03224-4

Cited by 71 publications

(47 citation statements)

References 48 publications

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“…[ 100,102 ] It is difficult to avoid the formation of macropores inside freeze‐dried nanocellulose aerogels as growing ice crystals persistently results in large spaces after the sublimation process, limiting further improvement in the thermal insulation properties. [ 103 ] SiO 2 nanoparticles can provide numerous mesoporous aerogels based on the original structure of the nanocellulose aerogel by increasing the SSA and surface roughness of the aerogel, [ 104 ] to limit collision between air molecules, thus reducing the gas thermal conductivity of the composite aerogel as a superinsulator based on the Knudsen effect. [ 102a ] The CNF/SiO 2 composite aerogel can withstand the long‐term high‐temperature test, indicating its excellent thermal insulation performance.…”

Section: Modification Of Nanocellulose Aerogels and Composite Fabricamentioning

confidence: 99%

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Recent Progress on Nanocellulose Aerogels: Preparation, Modification, Composite Fabrication, Applications

et al. 2021

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The rapid development of modern industry and excessive consumption of petroleum‐based polymers have triggered a double crisis presenting a shortage of nonrenewable resources and environmental pollution. However, this has provided an opportunity to stimulate researchers to harness native biobased materials for novel advanced materials and applications. Nanocellulose‐based aerogels, using abundant and sustainable cellulose as raw material, present a third‐generation of aerogels that combine traditional aerogels with high porosity and large specific surface area, as well as the excellent properties of cellulose itself. Currently, nanocellulose aerogels provide a highly attention‐catching platform for a wide range of functional applications in various fields, e.g., adsorption, separation, energy storage, thermal insulation, electromagnetic interference shielding, and biomedical applications. Here, the preparation methods, modification strategies, composite fabrications, and further applications of nanocellulose aerogels are summarized, with additional discussions regarding the prospects and potential challenges in future development.

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Section: Modification Of Nanocellulose Aerogels and Composite Fabricamentioning

confidence: 99%

“…[ 102a ] The CNF/SiO 2 composite aerogel can withstand the long‐term high‐temperature test, indicating its excellent thermal insulation performance. [ 103 ]…”

Section: Modification Of Nanocellulose Aerogels and Composite Fabricamentioning

confidence: 99%

Recent Progress on Nanocellulose Aerogels: Preparation, Modification, Composite Fabrication, Applications

et al. 2021

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“…The energy needed to sustain a pleasant interior atmosphere accounts for more than 10% of the world's total energy consumption 1 . In view of the world's energy shortage, taking full advantage of energy is one effective way of reducing unnecessary consumption, which entails efficient thermal isolation material (TIM) 2 . At present, there are numerous kinds of organic TIMs in the market, among which expanded polystyrene, extruded polystyrene, polyurethane, epoxy resin, polypropylene are in the majority.…”

Section: Introductionmentioning

confidence: 99%

Thermally induced fire early warning aerogel with efficient thermal isolation and flame‐retardant properties

Yuan

2021

Polymers for Advanced Techs

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Due to the energy‐saving demands in chemical industries and building fields, thermal isolation materials (TIMs) are widely used. The general exploitation of combustible TIMs calls for timely fire alerts as well as flame‐retardant modifications. This work provides a novel paradigm to address the issues simultaneously by preparing a multifunctional aerogel via a facile and environmentally friendly freeze‐drying method. With the doping of ammonium polyphosphate and graphene oxide (GO), cellulose nanofiber‐based aerogel exhibits excellent thermal‐isolating as well as flame‐retardant properties. The composite aerogel displays flameless pyrolysis as well as increased residue char. A fire‐warning detector is designed to reliably monitor the early fire. Based on the flame‐induced electrical resistance transformation characteristic of GO, it endows the composite aerogel with an ultra‐fast fire‐response time of ~2.6 s and a durable alarm signal. The flame‐retardant and fire‐alarm mechanisms are concluded. Overall, these results suggest that this composite aerogel has an enticing prospect in chemical industries and high‐rise buildings, which may lay the foundation for designing multifunctional TIMs. The modified aerogel broadens its application territory by intrinsic fire‐alarm characteristics, which covers the deficiency of delaying reaction as well as restricted application scenarios in traditional fire detectors.

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“…Biomass‐based cellulosic aerogels not only possess some excellent properties, such as low density, high specific surface area, and high porosity, but also have the advantages of being natural, renewable, and degradable. They are widely used in sound insulation, adsorption, and other fields and also possess broad application prospects in the field of TIMs 13‐17 . Cellulose aerogel is a kind of flammable material, thus it is particularly important to design cellulose aerogel with flame‐retardant property to effectively prevent fire and reduce the damage caused by fire 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Flame‐retardant cellulose nanofiber aerogel modified with graphene oxide and sodium montmorillonite and its fire‐alarm application

Zuo

Yuan

2021

Polymers for Advanced Techs

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Thermal insulation materials (TIMs) are widely used to realize energy conservation in buildings, but most of the commonly used organic TIMs are flammable. A novel biomass‐based aerogel is produced by an environmentally friendly vacuum freeze‐drying method, and a facile approach is proposed to improve the flame‐retardant performance of cellulose nanofiber (CNF) aerogels by modifying them with graphene oxide (GO) and montmorillonite (MMT). GO and MMT form a barrier that blocks the contact between the composite aerogel and the external oxygen, achieving the flame‐retardation effect. Notably, based on the high‐temperature thermal reduction characteristic of GO, a fire‐alarm system that can provide an ultrasensitive and reliable fire‐warning signal is designed. A fire alarm of CNF‐MMT‐GO‐50% can be triggered in approximately 1.9 seconds and lasts for more than 137.0 seconds when the aerogels are attacked by fire. This work helps to develop advanced TIMs to solve the shortcomings of traditional organic insulation materials and supplies a newfangled idea for the design of fire‐alarm sensors, showing promising applications in building insulation, firefighting, and chemical industry.

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Cellulose nanofibril (CNF) based aerogels prepared by a facile process and the investigation of thermal insulation performance

Cited by 71 publications

References 48 publications

Recent Progress on Nanocellulose Aerogels: Preparation, Modification, Composite Fabrication, Applications

Recent Progress on Nanocellulose Aerogels: Preparation, Modification, Composite Fabrication, Applications

Thermally induced fire early warning aerogel with efficient thermal isolation and flame‐retardant properties

Flame‐retardant cellulose nanofiber aerogel modified with graphene oxide and sodium montmorillonite and its fire‐alarm application

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